Skiving-machine



FQMLGARTER.' `Skiv'ing-Machine.

No. 225,340, 'Patent-ed Maf. 9, 18.80.'

O o O O UNITED STATES PATENT OFFICE.

FRANCIS M. CARTER, oE MARLBoRoUeH, MASSACHUSETTS.

SKIVING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 225,340, dated March 9,188..

Application led January 2, 1880.

bed upon which the material rests and the skiving blade or knife, thatthe center of rotation of the said roller, as itrises, by reason ofincrease in the thickness of material being operated upon, is movedbackward with relation to the cutting-edge of said blade, "so as toalways keep the edge of the -said blade at the saine distance from thesaid roller, which bears upon the said material being skived, no matterwhat may be its thickness, and in this way the formation of wrinklesbetween the acting face or portion of this wheel and the edge of theblade are avoided, especially when skiving very thin material.

In skiving machines as heretofore constructed the usual roller to bearupon the material just in advance ofthe cutting-edge of the blade hasbeen so supported as to be moved only in a vertical direction; and itwill be obvious, under such construction, that the peripherical portionof the said roller bears upon the said material more or less remote fromthe edge of the blade, according to the varying thickness of the saidmaterial, and

consequently, with thin material, bunches or wrinkles are apt to beformed between thc wheel and' edge of the blade.

In this my machine the roller referred to is also the feeding-roller,and it is mounted upon the end of a rotatable shaft having its bearings,as herein shown, in pivoted arms. The descent of the said roller islimited by a suitable screw.

Figure l represents, in front elevation, a skiving-machine constructedin accordance with my invention; Fig. 2, a side elevation thereof, withpart of the overhanging arm broken away to show the bearings for theshaft 'of the roller, the latter being omitted to show the positionofthe knife or blade. Fig. 3 is a partial section of the blade-holder onthe dotted line, Fig. 2; Fig. 4, a detail, showing the top of thevertically-adjustable bed and the blade-holder; and Fig. 5 is a detailof the roller.

The frame a, overhangingarin b, post c, bed

d, its shank e, and gage i are substantially as in my Patent No.210,183. The rollerg, which presses upon the material being skived, andwhich, as herein shown, is also the feeding device, is attached to theforward end of a rotatable shaft, h, having its bearings in arms j k,pivoted to the arm b by screws l on. At its rear end shaft /L has apinion, a, which is held pressed into engagement with the gearwheel o,fast on hub p of the drivin g-wheel q, by means of a spring, r, madeadjustable by screw s.

The screw l serves as a pivotal point for the bearing j, and as theWheel grises and falls it is forced to move in the arc of a circleaboutthe said screw Z, and consequently backward and forward with relation tothe edge 2 of the blade or knife w, rather than vertically or at rightangles to the top of the bed d, as heretofore common; andmoving backwardand forward with relation to the edge 2, as the roller rises and falls,the said edge and the acting portion of the roller are always kept quiteclose together, notwithstanding variation in the thickness ot' thematerial, which is a matter of much importance, especially with verythin stock, for thereby the formation otwrinkles between the edge 2androller is avoided and the skiving is uniform, whereas it' wrinklesform the skiving is irregular and wavy.

The regulating device a2 (shown as a screw) actsto determine themovement of the arm 7c, and consequently the descent of the roller orwheel g toward bed d, the regulating device being adjusted according towhether thick or thin material is to be skived; but the said roller isfree to rise against the stress of the spring r.

The roller g (see Fig. 5) has diamond-shaped teeth, in order that eachtooth may overlap a IOO tooth of the row next to it. This constructionlcssens the tendency ofthe teeth to mar or deface the leather.

The blade fw is held between jaws b2 c2. A bolt, 3, is extended throughjaw b2, and into and through a bearing, 4, at the top of a shank, 5,made vertically adjustable in a split bearing-sleeve, d2, having ahorizontal stud, m, which is extended into and made horizontallyadjustable in a sleeve or bearing, f2, herein shown as cast with theframe ct, as is also the posto. v

The jaw b2 may be turned about the bolt 3 as a center, to thereby changethe angle at which the blade w is to extend across the rear edge of thebed (l, according to the quantity of stock it is desired to remove fromthe edge ofthe material being skived, and is held in adjusted position,between the head of the said bolt and the side of the bearing 4, bymeans of the handled nut g2, which is screwed upon the end of the saidbolt, as shown in section, Fig. l.

The sleeve d2, split open at its rear side and having two ears, one ofwhich only is shown at d3, has a handled bolt, d4, extended through thesaid ears, so as to cause the said sleeve d2 to clamp and hold the shank5 in any position to which it may be adjusted vertically, as it isdesired to skive thick or thin stock.

The bearing d2, adapted, as described, to be adjusted horizontally, maybeheld in adjusted position by means of the handled screw h2.

The jaw c2, which receives the edge 8 of the blade w, is connected withjaw b2 by a screw, i2, extended through a hole in the jaw c2, larger indiameter than the shank of the said screw, in order to permit the saidjaw c2 to be raised or lowered independently of the jaw bz when it isdesired to give the cutting-edge 2 more or less rake. This isaccomplished by the adjusting-screw Z2, extended loosely through the earl0 of thejaw b2, and screwed into the lug ll of the jaw c2. A spiralspring, 12, about screw Z2 prevents it from being moved accidentally.

The large milled nut f3 of the bed-adjusting screw f is seated and heldin a slot between the post c and the bed, as shown clearly in Fig.2, andas the said nut is turned the screw acts to raise or lower the bed dpositively.

The bed d at its top is provided with a re. movable steel or otherplate, m2, more durable than cast-iron, to thereby obviate wearing thebed, as would otherwise be the case, as the roller g presses thematerial against it. This plate m2, slid into a groove in the bed, isheld in place, as herein shown, by the gage i.

This machine may be used to. skive leather, leather-board, and likematerial.

The spring l5, attached to the arm b, and

extended over the top of the guide, prevents the edge of the materialbeing skived from curling up over or working across the top of theguide.

I claiml. In a skiving-machine, a bed to support the material, a bladeto skive it, and a roller to press upon the material in advance of thecutting-edge of the blade, the roller having its supports arranged topermit the said roller, in its rising and falling movements, to alsomove backward and forward with relation to the cutting-edge of the saidblade, in order to obviate the formation of wrinkles between the rollerand blade as the material is being skived, substantially as described.

2. The roller g, provided with diamondshaped teeth to extend one beyondthe other at their ends, as shown, substantially as and for the purposedescribed.

3. The roller to bear upon the material, and

lits shaft h, combined with the movable arms in which the shaft has itsbearings, to permit the said roller and shaft, during its rotation, tobe moved upward and backward, and vice versa, substantially asdescribed.

4. The combination, with the bed and blade, of a roller to bear upon thematerial in advance of the cutting-edge of the blade, and the supportsfor the roller, combined with the regulating device to govern both thedownward and forward position ofthe said roller with relation to thebed. and cuttingedge of the blade, sub-4 stantiall y as described.

5. In a skiving-machine, the roller-carrying shaft h and its movablesupporting-arms, and the pinion u on the said shaft, combined with therotatable gear 0,'with which the pinion a is always in engagement,notwithstanding variations in the position of the said shaft and roller,substantially as described.

6. In a skiving-machine, the bed d and roller g, com bin ed with theremovable piece m2, harder than the said bed, all substantially as andfor the purpose described.

7. In combination, the blade, jaws b2c?, vertically-adjustable bearing 4and shank 5, a bolt to hold and adjust the jaws in the bearing 4, andthe sleeve and horizontally-adj ustable stud x, and devices to hold thesaid shank and stud in adjusted position, substantially as and for thepurpose described.

In testimony whereof I have signed my name to this speciiication in thepresence of two subscribing witnesses.-

FRANCIS M. CARTER.

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